Airtime Disappearing

Since last month, my prepaid airtime started disappearing without me subscribing to any services. I have Dialled *140*5# and it says I am not subscribed to anything. I have not called customer care because I know it is always a rat chase with them and everyone gives a different story. I load R15 and in a matter of 1 hour it will be deducted. My number is ***.<br> Please assist in this matter. I cannot use my phone as it will always have a balance of R0.00